I would love to see Harvey Bullock having some kind of major role, and not just in the first film, but for the entire series...maybe for his arc we see him as someone who hates Batman and then grows to trust him as Gordon does. One fault in Nolan's trilogy as Gordon is the only mainstay GCPD character in the trilogy and when Batman finally does win the cops over, it's with new characters and not the past bad cops that could've turned good such as Flass.